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Intro to equations with variables on both sides (video) | Khan Academy

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Let's try to solve a more involved equation. So, let's say that we have 2x plus 3, 2x plus 3 is equal to is equal to 5x minus 2. So this might look a little daunting at first. We have x's on both sides of the equation. We're adding and subtracting numbers.

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MGSE9
-12.A.CED.1 Create equations
and inequalities in one variable and use
them to solve problems. Include equations
arising from linear and quadratic
functions, and simple rational and
exponential functions (integer inputs
only).
MGSE9
-12.A.CED.2 Create linear and
exponential equations in two or more
variables to represent relationships
between quantities; graph equations on
coordinate axes with labels and scales.
(The phrase “in two or more variables”
refers to formulas like the compound
interest formula, in which A = P(1 + r/n)nt
has multiple variables.)
MGSE9
-12.A.CED.3 Represent
constraints by equations or inequalities,
and by systems of equations and/or
inequalities, and interpret data points as
possible (i.e. a solution) or not possible
(i.e. a non
-solution) under the established
constraints.
MGSE9
-12.A.CED.4 Rearrange
formulas to highlight a quantity of
interest, using the same reasoning as in
solving equations